Justice Antonin Scalia said states have been careful to adopt procedures that do not seek to inflict pain and should not be barred from carrying out executions even if prison officials sometimes make mistakes in administering drugs. "There is no painless requirement" in the Constitution, Scalia said. Chief Justice John Roberts and Justice Samuel Alito also indicated their support for the states’ procedures.
Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted.
This idea that if the Constitution doesn’t spell something out verbatim is silly. It’s playground stuff.